# DISPERSED LASER INDUCED FLUORESCENCE OF METALLIC MOLECULAR IONS. IDENTIFICATION OF NEW LOW-LYING ELECTRONIC STATES OF $TiCl^{+}$ AND $TiF^{+}$

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 Title: DISPERSED LASER INDUCED FLUORESCENCE OF METALLIC MOLECULAR IONS. IDENTIFICATION OF NEW LOW-LYING ELECTRONIC STATES OF $TiCl^{+}$ AND $TiF^{+}$ Creators: Focsa, Cristian; Pinchemel, B. Issue Date: 1999 Publisher: Ohio State University Abstract: The dispersed laser-induced technique has been applied for the first time to metallic molecular ions. The $TiCl^{+}$ and $TiF^{+}$ ions were produced by a high-voltage discharge in hbelium with traces of $TiCl_{4}$ or $TiF_{4}$, respectively. A c.w. dye-laser and a grating specytrometre were used a record low-resolution spectra of these species in the visible region. This led to the the observation of new low-lying electronic states of these ions: the $C^{3}\Pi (\sim 1535 cm^{-1})$ state of $TiCl^{+}$, the $B^{3} \Delta (\sim 2040 cm ^{-1})$ and $C^{3}\Pi (\sim 2200 cm^{-1})$ states of $TiF^{+}$. The identification of these new states contributes to a better characterization of the first 3000 $cm^{-1}$ of the energy level diagram of these molecules. The experimental position of the $C^{3}\Pi$ state of $TiCl^{+}$ is in good agreement with theoretical predictions given by a Ligend Field Theory $model.^{a}$ We have extended these calculations of the $TiF^{+}$ isovalent ion, taking advantage of the new experimental data. Both experimental and theoretical new results presented here are expected to help future high-resolution investigations on these species. $^{a}$ C. Focsa, M. Bencheikh, and L. G. M. Petterson, J. Phys. B. At. Mol. Opt. Phys. 31, 2857-2869 (1998). $^{1}$ Present address: Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada N2L 3GT1. Description: Author Institution: Laboratoire de Physique des Lasers, Atomes et Mol\'ecules, UMR CNRS 8523, Centre d'Etudes et de Recherches Lasers et Applications, Universit\'e des Sciences et Technologies de Lille URI: http://hdl.handle.net/1811/19507 Other Identifiers: 1999-TH-15